I found a political flyer tucked into the doorhandle of my car the other day. I'm not a fan of people putting unwanted papers on my car without my permission. The funny thing is that this was a flyer in support of a candidate I was considering voting for because I did not care for the voting record of their opponent. Now I'm unhappy with that candidate because their campaign led to trash being left on my property and I might just end up voting against them out of spite.
An unwanted and worthless item left on my property is considered littering in my book. All it does is clutter up my car until I can do the responsible thing and throw it in a trash can or recycle bin where it belongs.
Let it be known that if you put a political flyer on my car I will probably end up voting against you on principal. So if you're smart you'll put your opponent's flyers on my car. ;)